#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#define N 30000
int main()
{
    float x,y;
    int c=0,d=0;
    while(c++<=N)
    {
        x=rand()%101;
        y=rand()%101;
        if(x*x+y*y<=10000)
        d++;
    }
    printf(" pi=%f\n",4.*d/N);
}